BNC-2121

National Instruments Shielded Counter/Timer BNC Terminal Block

1. General Description

2. Part Number

3. Interface Layout

• 14 BNC ports for high-frequency timing and trigger signals

• 40-position spring terminal block for parallel digital lines and power signals

• Rear 68-pin shielded connector for connection to NI DAQ and counter/timer cards

• Onboard LED indicators for digital line status

4. Key Specifications

• Signal impedance: 50 ohm for BNC ports

• Operation type: fully passive, no external power supply required

• Built-in test signal: square wave function generator, quadrature encoder simulation signal, trigger reference signal

• Mounting: desktop placement, optional DIN rail installation

• Operating temperature: 0 °C ~ 55 °C

• Storage temperature: -40 °C ~ 70 °C

• Humidity: 5% ~ 90%, non-condensing

• Full metal shielding for anti-interference and EMI suppression

5. Compatibility

6. Main Features

• Dedicated design for counter, timer and encoder signal routing

• Integrated standard test signals simplify equipment verification and calibration

• BNC interface ensures stable high-speed signal transmission

• Spring terminals facilitate quick wiring of digital I/O lines

• Metal shielded housing effectively reduces external noise interference

• LED status indication for easy on-site troubleshooting

7. Applications

• Precision pulse measurement and frequency acquisition

• Quadrature encoder signal connection and simulation test

• Automated test system timing and trigger signal distribution

• Laboratory counter/timer experiment and industrial equipment signal wiring